To delete a class from the knowledge base:
To delete multiple classes:
Deleting a class deletes the class and all of its subclasses. Once a class has been deleted it cannot be recovered.
However, if you close Protégé-2000 without saving changes, you will revert to the last saved version. If you have made extensive changes to your project during the current session, you may wish to save before deleting classes. To do this, select Save from the Project menu.
Classes cannot be deleted if they either are a system class or are included from another project. The class icon to the left of the class indicates the class type. See Including a Project for information about project inclusion.
Next: Viewing a Class